CN105782700A - Steam-liquid two-phase flow drain valve and draining method thereof - Google Patents
Steam-liquid two-phase flow drain valve and draining method thereof Download PDFInfo
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- CN105782700A CN105782700A CN201410819089.4A CN201410819089A CN105782700A CN 105782700 A CN105782700 A CN 105782700A CN 201410819089 A CN201410819089 A CN 201410819089A CN 105782700 A CN105782700 A CN 105782700A
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- phase flow
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- water level
- drain valve
- signal pipe
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Abstract
The invention discloses a steam-liquid two-phase flow drain valve and a draining method thereof. The common electric or float steam drainer has the defects that erosive wear is easily caused, jam faults often happen, the overhaul and maintenance workload is high and a draining device is easily out of control because an actuating mechanism frequently acts. The steam-liquid two-phase flow drain valve comprises a sensing signal pipe (1) and a regulator (2), wherein the regulator is composed of a shell, a connecting flange and a convergent-divergent valve element; and a regulator inlet (3) is located in the middle and is connected with the sensing signal pipe. The steam-liquid two-phase flow drain valve is used for water level control of pressure vessels such as high/low-pressure heaters, continuous blowdown flash tanks, raw water heaters and heating network heaters in the electric power industry.
Description
Technical field:
The present invention relates to a kind of stream-liquid two-phase flow drain valve and trapping method thereof.
Background technology:
Modern thermal power plant all arranges feed-water heater for improving thermal efficiency of cycle, and heater requires that when normal operation shell-side water level is maintained within a certain range, the too high or too low heat-economy not only reducing unit of water level, and the safe operation of entail dangers to main frame.Such as water level is too high causes turbine water induction to cause the major accidents such as leaf destruction, permanent bending of rotor, heater explosion, at home and abroad repeatedly occurs.Or owing to water level is too low, even run without water level, cause a large amount of steam to overflow in heater, latent heat does not make full use of, heater heat-transfer effect severe exacerbation, and feed temperature declines, and makes unit coal consumption increase.One 200MW unit to increase about 2000t every year, drain water piping flow due to steam-water twin phases simultaneously impact and wash away seriously.Conventional electronic or bucket trap, due to actuator frequent movement, easy erosive wear, normal bite is malfunctioning, and repair and maintenance amount is big, and steam trap connection is easily out of control.
Summary of the invention:
It is an object of the invention to provide a kind of stream-liquid two-phase flow drain valve and trapping method thereof.
Above-mentioned purpose is realized by following technical scheme:
A kind of stream-liquid two-phase flow drain valve, its composition includes: transducing signal pipe and actuator, described actuator is made up of the spool of housing, connection flange and a convergent gradually expanded form, and middle part is actuator import, and described actuator import is connected with described transducing signal pipe.
Described stream-liquid two-phase flow drain valve, described transducing signal pipe is connected with heater, and described heater is connected with water-level gauge.
Described stream-liquid two-phase flow drain valve, described actuator is connected with isolating valve, described actuator and described isolating valve and bypass valve parallel join.
A kind of trapping method of described stream-liquid two-phase flow drain valve, the method step is as follows:
When in heater, water level rises, correspondingly in signal pipe, water level also rises, cause that the flow area sending gas reduces, regulate vapour phase flow in pipeline to reduce, liquid phase flow increases, and causes that regulating valve throat vapour phase flow area reduces, and hydrophobic effective flow area increases, thus hydrophobic output, constantly increases, finally equilibrium establishment on new thin height of water level；
When water level decreasing in heater, correspondingly in signal pipe, water level also declines, cause that the flow area sending gas increases, regulate vapour phase flow in pipeline to increase, liquid phase flow reduces, and causes that regulating valve throat vapour phase flow area increases, and hydrophobic effective flow area reduces, thus hydrophobic output, constantly reduces, finally equilibrium establishment on new thin height of water level.
Beneficial effects of the present invention:
The present invention utilizes stream-liquid two-phase flow equilibrium principle, realize liquid automatic control, mechanical movable part and the electronic component of easy erosion are abandoned, overcome the insoluble problem of general drainage controller, ensure that drain-regulating system safe and reliable operation, can improving feed temperature, coal consumption significantly reduces, and this apparatus structure is simple, can non-maintaining, convenient management long service life.
The present invention is without any moving component, mechanical and electric actuator, and good reliability, not by external interference.Capacity of resisting disturbance is strong, and security performance is high；Can realizing Automatic continuous to regulate, self-regulated ability is strong, and liquid level is relatively stable；Drive without external force, belong to self-operated type Intelligent adjustment.
Accompanying drawing illustrates:
Accompanying drawing 1 is the fundamental diagram of the present invention.
Detailed description of the invention:
Embodiment 1:
A kind of stream-liquid two-phase flow drain valve, its composition includes: transducing signal pipe 1 and actuator 2, described actuator is made up of the spool of housing, connection flange and a convergent gradually expanded form, and middle part is actuator import 3, and described actuator import is connected with described transducing signal pipe.
Embodiment 2:
Stream-liquid two-phase flow drain valve according to embodiment 1, described transducing signal pipe is connected with heater 4, and described heater is connected with water-level gauge 5.
Embodiment 3:
Stream-liquid two-phase flow drain valve according to embodiment 1 or 2, described actuator is connected with isolating valve 6, described actuator and described isolating valve and bypass valve 7 parallel join.
Embodiment 4:
The trapping method of the stream-liquid two-phase flow drain valve that one of a kind of embodiment 1-3 is described, the method step is as follows:
When in heater, water level rises, correspondingly in signal pipe, water level also rises, cause that the flow area sending gas reduces, regulate vapour phase flow in pipeline to reduce, liquid phase flow increases, and causes that regulating valve throat vapour phase flow area reduces, and hydrophobic effective flow area increases, thus hydrophobic output, constantly increases, finally equilibrium establishment on new thin height of water level；
When water level decreasing in heater, correspondingly in signal pipe, water level also declines, cause that the flow area sending gas increases, regulate vapour phase flow in pipeline to increase, liquid phase flow reduces, and causes that regulating valve throat vapour phase flow area increases, and hydrophobic effective flow area reduces, thus hydrophobic output, constantly reduces, finally equilibrium establishment on new thin height of water level.
Claims (4)
1. a stream-liquid two-phase flow drain valve, its composition includes: transducing signal pipe and actuator, it is characterized in that: described actuator is made up of the spool of housing, connection flange and a convergent gradually expanded form, and middle part is actuator import, and described actuator import is connected with described transducing signal pipe.
2. stream-liquid two-phase flow drain valve according to claim 1, is characterized in that: described transducing signal pipe is connected with heater, and described heater is connected with water-level gauge.
3. stream-liquid two-phase flow drain valve according to claim 1 and 2, is characterized in that: described actuator is connected with isolating valve, described actuator and described isolating valve and bypass valve parallel join.
4. a trapping method for stream-liquid two-phase flow drain valve described for one of claim 1-3, is characterized in that: the method step is as follows:
When in heater, water level rises, correspondingly in signal pipe, water level also rises, cause that the flow area sending gas reduces, regulate vapour phase flow in pipeline to reduce, liquid phase flow increases, and causes that regulating valve throat vapour phase flow area reduces, and hydrophobic effective flow area increases, thus hydrophobic output, constantly increases, finally equilibrium establishment on new thin height of water level；
When water level decreasing in heater, correspondingly in signal pipe, water level also declines, cause that the flow area sending gas increases, regulate vapour phase flow in pipeline to increase, liquid phase flow reduces, and causes that regulating valve throat vapour phase flow area increases, and hydrophobic effective flow area reduces, thus hydrophobic output, constantly reduces, finally equilibrium establishment on new thin height of water level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410819089.4A CN105782700A (en) | 2014-12-25 | 2014-12-25 | Steam-liquid two-phase flow drain valve and draining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410819089.4A CN105782700A (en) | 2014-12-25 | 2014-12-25 | Steam-liquid two-phase flow drain valve and draining method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105782700A true CN105782700A (en) | 2016-07-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410819089.4A Withdrawn CN105782700A (en) | 2014-12-25 | 2014-12-25 | Steam-liquid two-phase flow drain valve and draining method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105782700A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956522A (en) * | 2017-12-06 | 2018-04-24 | 中国船舶重工集团公司第七0三研究所 | One kind dehumidifying level gradual-enlargement type cylinder hydrophobic structure |
| CN110307466A (en) * | 2019-08-05 | 2019-10-08 | 邢台旭阳化工有限公司 | A kind of liquid level visual steam trap |
-
2014
- 2014-12-25 CN CN201410819089.4A patent/CN105782700A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956522A (en) * | 2017-12-06 | 2018-04-24 | 中国船舶重工集团公司第七0三研究所 | One kind dehumidifying level gradual-enlargement type cylinder hydrophobic structure |
| CN110307466A (en) * | 2019-08-05 | 2019-10-08 | 邢台旭阳化工有限公司 | A kind of liquid level visual steam trap |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160720 |